The number 47428
47428 is a composite number with 12 divisors. Its prime factorisation is × 71 × 167. Divisors (12): 1, 2, 4, 71, 142, 167, 284, 334, 668, 11857, 23714, 47428.
Pick any whole number from 1 to 100,000.
How to work it out
- 1
47428 has no famous special property in the usual lists (prime, square, cube, triangular, Fibonacci, palindrome, perfect), but it is still a composite number.
- 2
47428 is composite. Its prime factorisation is
- 3
The divisors add up to 84672; without 47428 itself that is 37244, so 47428 is deficient (37244 is less than 47428). Euler's totient φ(47428) = 23240 numbers up to 47428 share no factor with it.
- 4
The digits of 47428 add up to 25, and repeating that until one digit is left gives the digital root 7. The Collatz sequence (halve if even, else 3n+1) takes 189 steps to reach 1.
LaTeX source of the formulas on this page
\[ 47428 = 2^{2} \times 71 \times 167 \]47428 at a glance
| Property | Value |
|---|---|
| Type | composite |
| Number of divisors | 12 |
| Sum of divisors | 84672 |
| Euler totient φ(n) | 23240 |
| Square | 2249415184 |
| Cube | 106685263346752 |
| Square root | 217.779705 (= 2√11857) |
| Digit sum / digital root | 25 / 7 |
| Collatz steps to 1 | 189 |
| Scientific notation | 4.7428 × |
47428 in other forms
| Form | Value |
|---|---|
| In words | forty-seven thousand four hundred and twenty-eight |
| Binary (base 2) | 1011100101000100 |
| Octal (base 8) | 134504 |
| Hexadecimal (base 16) | B944 |
| Base 3 | 2102001121 |
| As time | 47428 seconds = 13 h 10 min 28 s |
Is 47428 divisible by 2 to 12?
| Divisor | Answer | Rule |
|---|---|---|
| 2 | Yes (47428 ÷ 2 = 23714) | A number is divisible by 2 if the last digit is even (0, 2, 4, 6, 8). |
| 3 | No (remainder 1) | A number is divisible by 3 if the digits add up to a multiple of 3. |
| 4 | Yes (47428 ÷ 4 = 11857) | A number is divisible by 4 if the last two digits make a multiple of 4. |
| 5 | No (remainder 3) | A number is divisible by 5 if the last digit is 0 or 5. |
| 6 | No (remainder 4) | A number is divisible by 6 if it is divisible by both 2 and 3. |
| 7 | No (remainder 3) | A number is divisible by 7 if double the last digit and subtract it from the rest: the result is a multiple of 7. |
| 8 | No (remainder 4) | A number is divisible by 8 if the last three digits make a multiple of 8. |
| 9 | No (remainder 7) | A number is divisible by 9 if the digits add up to a multiple of 9. |
| 10 | No (remainder 8) | A number is divisible by 10 if the last digit is 0. |
| 11 | No (remainder 7) | A number is divisible by 11 if the alternating sum of the digits is a multiple of 11. |
| 12 | No (remainder 4) | A number is divisible by 12 if it is divisible by both 3 and 4. |
Questions
Is 47428 a prime number?
No. 47428 = × 71 × 167, so it is divisible by 2.
What are the factors of 47428?
1, 2, 4, 71, 142, 167, 284, 334, 668, 11857, 23714, 47428.
What is 47428 in binary?
1011100101000100 (hexadecimal B944, octal 134504).
What is the square root of 47428?
About 217.7797, exactly 2√11857.
Is 47428 divisible by 3?
No. Its digits add up to 25, which is not a multiple of 3.
What is special about the number 47428?
It is a composite number with 12 divisors.